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| PDF : |  10040131.pdf |
| title(En) : | Studies on the Powdered Dry-bonding Process in the Manufacture of Plywood. I. On the Relation between the Gluing Condition and the Strength of Adhesion |
| author(En) : | Tsutomu Tanaka |
| information : | Mokuzai Gakkaishi 10(4), 131-135 (1964) |
| assort : | Original Article |
| summary(En) : | Powdered Urea Resin is commonly used after dissolving in water and adding a hardening agent ; but in this study investigation was made about the dry-bonding process of powdered urea resin adhesive with a hardening agent previously mixed. The following results were obtained by consideration of the relation between the condition and the strength of adhesion in the method in which powdered urea resin itself was spread on the surface of the veneers without addition of water and was hot-pressed. It was newly found not only that good adhesive strength was obtained under the usual condition used in the solution type urea resin, but that this method had the noteworthy features of small amounts of glue spread, low gluing pressure, short pressing time and in high moisture content. It seems that those merits are due to effective utilization of the moisture in veneer and resin in the glue layer. It was also found that this method was superior to those of liquid type by the result of in- and out-door exposure tests for 22 months. |